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Ohm’s Law
Use Ohm’s Law to solve the following
equations.
1. What formula is used to calculate
current in a circuit?
A. Current (I) equals voltage (E) multiplied by resistance (R)
B. Current (I) equals voltage (E) divided by resistance (R)
C. Current (I) equals voltage (E) added to resistance (R)
D. Current (I) equals voltage (E) minus resistance (R)
2. What is the voltage across the resistor if a current of
0.5 amperes flows through a 2 ohm resistor?
A. 1 volt
B. 0.25 volts
C. 2.5 volts
D. 1.5 volts
3. What is the resistance of a circuit when a
current of 3 amperes flows through a resistor
connected to 90 volts?
A. 3 ohms
B. 30 ohms
C. 93 ohms
D. 270 ohms
4. What is the current flowing through a 100
ohm resistor connected across 200 volts?
A. 20,000 amperes
B. 0.5 amperes
C. 2 amperes
D. 100 amperes
5. What is the voltage across the resistor if a current
of 2 amperes flows through a 10 ohm resistor?
A. 20 volts
B. 0.2 volts
C. 12 volts
D. 8 volts
6. What is the current flowing through a
24 ohm resistor connected across 240 volts?
A. 24,000 amperes
B. 0.1 amperes
C. 10 amperes
D. 216 amperes
7. What formula is used to calculate
resistance in a circuit?
A. Resistance (R) equals voltage (E) multiplied by current (I)
B. Resistance (R) equals voltage (E) divided by current (I)
C. Resistance (R) equals voltage (E) added to current (I)
D. Resistance (R) equals voltage (E) minus current (I)
8. What is the schematic symbol used to
represent an Ohm?
A. ∆
B. Ω
C. ∑
D. ∞
9. A 110 volt wall outlet supplies power to a strobe light
with a resistance of 2200 ohms.
How much current is flowing through the strobe light?
A. 0.5 amps
B. 2.0 amps
C. 0.05 amps
D. 1.0 amps
10. A CD player with a resistance of 40 ohms has a current of 0.1
amps flowing through it. Sketch the circuit diagram and calculate
how many volts supply the CD player?
A. 0.0025 Volts
B. 4.0 Volts
C. 10.0 Volts
D. 400.0 Volts